For traditional commissions, prices are for a commission on 8.5"x11" paper, a single charcater, and simple BG like in the sample.
For Inks and Colors if you are getting a SFW commission you can choose to get a 20% discount if you choose the "Sketh book" option. Meaning your commission will be drawn in my sketchbook, you will not be able to own it in person, but you will get a high res scan.
If you want to do this with your sketch it's a less of a discount and is a case by case amount as well. Just ask.